In this video we demonstrate how to test the linearity of the GE LM2500 gas turbine vibration monitoring and protection system at critical low and high pressure rotor speeds. We also separate the Meggitt 6240M series accelerometer from the Bently Nevada 86517 Acceleration Interface
Module and perform a frequency response sweep calibration.
The Meggitt 6240M series, Vibro-Meter CA303 and CA306 series transducers are differential charge accelerometers that interface directly to The Modal Shop’s C9110D or
9110F Portable Vibration
The Bently Nevada 86517 Acceleration Interface Module typically serves to integrate the signal from the differential charge accelerometers and convert to a readable voltage output within the turbine monitoring system. Although this device can also be
used in non-integrated acceleration output mode as well. Either way, the output of the 86517 is easily tested with The Modal Shop's Portable Vibration Calibrators, allowing technicians to loop check the system and create a full calibration report.
After market replacements for the Meggitt 6240M series and Vibro-Meter CA303 / CA306 are offered by PCB Piezotronics. The Modal Shop produced a webinar on our YouTube channel to further educate technicians
on the pros and cons of PCB’s offering compared to alternatives.